package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号 ,根据前台传过来的phone参数 校验
        if (RegexUtils.isPhoneInvalid(phone)){
            //2.校验结果不符合，返回错误信息
            return Result.fail("请输入正确的手机号");
        }
        //3.校验结果符合，生成验证码 长度6位
        String code = RandomUtil.randomNumbers(6);
//        //4.保存验证码到session
//        session.setAttribute("code",code);
        //4.保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //5.发送验证码【模拟】
        log.debug("发送验证码成功，验证码为：" + code);
        //6.返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)){
            // 校验结果不符合，返回错误信息
            return Result.fail("请输入正确的手机号");
        }
        //2.从redis中获取验证码并校验
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if(cacheCode == null || !cacheCode.equals(code)){
            //3.不一致 返回错误提示
            return Result.fail("验证码错误，请重新输入！！");
        }
        //4.一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();

        //5.判断用户是否存在
        if (user == null) {
            //6.不存在，创建新用户并保存
            user = creatUserWithPhone(phone);
        }
//        //7.存在，保存用户信息到session 为防止用户信息泄露 采用UserDTO保存
//        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
//        session.setAttribute("user",userDTO);
        //7.存在，保存用户信息到redis
        //7.1 生成随机token 作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //7.2 将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                    .setIgnoreNullValue(true)
                    .setFieldValueEditor((filedName,fiedValue) -> fiedValue.toString()));
        //7.3 存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);
        //7.4 设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);
        //8 返回token
        return Result.ok(token);
    }

    @Override
    public Result queryUserById(Long userId) {
        // 查询详情
        User user = getById(userId);
        if (user == null) {
            return Result.ok();
        }
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        // 返回
        return Result.ok(userDTO);
    }


    private User creatUserWithPhone(String phone) {
        //创建新用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //保存新用户
        save(user);
        return user;
    }


    @Override
    public Result sign() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是本月第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.写入redis SETBIT key offset 1
        stringRedisTemplate.opsForValue().setBit(key, dayOfMonth - 1, true);

        return Result.ok();
    }

    @Override
    public Result signCount() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是本月第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.获取本月截至当前的所有签到记录，返回一个十进制数字 BITDIDE sign:5:202203 GET u 14 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.isEmpty()){
            //没有任何签到结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0){
            return Result.ok();
        }
        //6.循环遍历
        int count = 0;
        while (true) {
            //6.1 让这个数字与1做运算，得到数字的最后一个bit位 //判断这个bit位是否为0
            if ((num & 1) == 0){
                //如果为0 说明未签到 结束
                break;
            }else {
                //不为0 计数器+1
                count++;
            }
            //将数字右移 并抛弃掉最后一个bit 继续下一个bit
            num >>>= 1;
        }
        return Result.ok(count);
    }

}
